Thread: Don't know how to factor?

Hello,

I have the following equation:

v1/v2 = R2/R1+R2

How do we solve for R2?

I don't know how to isolate R2 on one side of the equation. All help is appreciated?

thanks

[QUOTE=simplyComplex;773431]I have the following equation:
v1/v2 = R2/R1+R2
How do we solve for R2?/QUOTE]

Is it

Because you actually posted

Which is it?

If it is , start by multiplying both sides by to get .

If it is , start by writing as so you have and now multiply by .

Ooops I'm sorry.... Its:

v1/v2 = R2/(R1 + R2)

start by multiplying both sides by v2(R1 + R2) to get....

stop, you are going too fast for me!!!! If I start off with this:

v1/v2 = R2/(R1 + R2)

so when you say cross multiply... do you mean like this:
(R1 + R2) (v1/v2) = (R2/(R1+R2)) (v2)
v1(R1 + R2) = R2v2
v1R1 + v1R2 = R2v2


So now, R2 is on both sides, what I really need is to isolate R2 on one side!!!!
So what is the next step?

thanks

Okay I think I got it:

v1/v2 = R2/(R1 + R2)
(R1 + R2) (v1/v2) = (R2/(R1+R2)) (v2)
v1(R1 + R2) = R2v2
v1R1 + v1R2 = R2v2
v1R1 = R2v2 - v1R2
v1R1 = R2(v2 - v1)

v1R1/(v2-v1) = R2(v2 - v1)/ (v2 - v1)

R2 = v1R1/(v2-v1)

Thanks!